Manzano-Sánchez, D. and Valero-Valenzuela, A. 2018. Differences between students according to physical activity and their motivation, basic psychological needs and responsibility. Journal of Human Sport and Exercise. 13, 2proc (Jul. 2018), S221-S230. DOI:https://doi.org/10.14198/jhse.2018.13.Proc2.06.